package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public Result sendCode(String phone, HttpSession session) {

        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.不符合 返回错误信息
            return Result.fail("手机号格式错误");
        }

        //3.生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4.保存到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5.发送验证码
        log.debug("发送验证码成功:{}",code);

        //返回ok
        return Result.ok();
    }

    public Result login(LoginFormDTO loginForm, HttpSession session) {

        //1.校验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.不符合 返回错误信息
            return Result.fail("手机号格式错误");
        }

        //2.从redis中获取验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();

        if(cacheCode == null || !cacheCode.equals(code)){
            //3.不一致 报错
            return Result.fail("验证码错误");
        }

        //4.根据手机号查询用户
        User user = query().eq("phone", phone).one();


        if(user == null){
            //5.不存在 创建新用户
            user = createUserWithPhone(phone);
        }

        //随机生成token 作为登陆令牌 uuid
        String token = UUID.randomUUID().toString(true);

        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);

        //将User转为Hash存储
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true).
                        setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString()));

        String tokenKey = LOGIN_USER_KEY + token;

        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);

        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL, TimeUnit.MINUTES);
        //6.存在 保存用户信息

        return Result.ok(token);
    }


    public Result logOut(HttpServletRequest request) {
        Long userId = UserHolder.getUser().getId();

        // 2. 删除Redis中的登录凭证（根据你的Token存储方式）
        String tokenKey = "login:token:" + request.getHeader("authorization");
        stringRedisTemplate.delete(tokenKey);

        // 3. 可选：记录登出日志
        log.info("用户 {} 已登出", userId);

        return Result.ok();
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(8));

        save(user);
        return user;

    }
}
